This instrument is used in submarines to observe activity above the water surface while the submarine is submerged. Which instrument are we talking about?

Binoculars

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Telescope

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Periscope

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Kaleidoscope

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Solution

The correct option is C Periscope
Periscope is an instrument used in submarines to observe activity above the water surface while the submarine is submerged. Periscope consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. More complex periscope uses the prisms or advances fiber optics instead of mirrors.

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